Function gpio_get_io_config 

pub unsafe extern "C" fn gpio_get_io_config(
    gpio_num: gpio_num_t,
    out_io_config: *mut gpio_io_config_t,
) -> esp_err_t

@brief Get the configuration for an IO

@param gpio_num GPIO number @param[out] out_io_config Pointer to the structure that saves the specific IO configuration

@return

• ESP_OK Success
• ESP_ERR_INVALID_ARG Parameter error